Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
phan duc » pham duc, phan tu, phan dau
cau tren » dau tren, ca tren, cau treo
trinh vi » trinh va, trinh ve, trinh viet
sach vu » sach va, sach tu, sach uu
tinh vi » tinh voi, tinh va, dinh vi
va phan » van phan, va phat, va phap
ra khoi » xa khoi, trao khoi, cac khoi
nang ra » nang ma, lang ra, nang ro
vu nang » vuc nang, va nang, vu dang
cu tren » tu tren, dua tren

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