Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau tren » cu tren, dau tren, cau treo
nang cac » nang cao, bang cac, hang cac
cac khoi » cac thoi, cac khoan, cach thoi
trinh vi » trinh va, trinh ve, trinh viet
phan duc » pham duc, phan tu, phan dau
tinh vi » tinh voi, tinh va, dinh vi
va phan » van phan, va phat, va phap
ca tren » cu tren, la tren, co tren
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach v nang cac khoi. lieu va phan duc va ((tinh vi) or (trinh vi)) ((cau tren) OR (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach v nang cac khoi. lieu va phan duc va ((tinh vi) OR (trinh vi)) ((cau tren) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach v nang cac khoi. lieu va phan duc va ((tinh vi) or (trinh vi)) ((cau tren) OR (ca tren))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach v nang cac khoi. lieu va phan duc va ((tinh vi) or (trinh vi)) ((cau tren) OR (ca tren))*.