Perhaps you should try some spelling variations:
trinh dai » trinh tai, trinh di, trinh da
toc sach » hoc sach, doc sach, thuoc sach
trung va » truong va, trang va, trung ha
tinh dai » tinh da, tinh hai, tinh doi
ha trung » he trung, ba trung, va trung
mai hoi » mai khoi, dai hoi, lai hoi
cua te » cua tu
y nang » ky nang, ly nang, v nang
me hoi » le hoi
va ha » va hoa, va kha, va han

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang ((me hoi) or (mai hoi)). lieu va ha trung va ((tinh dai) OR (trinh dai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((me hoi) OR (mai hoi)). lieu va ha trung va ((tinh dai) OR (trinh dai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((me hoi) or (mai hoi)). lieu va ha trung va ((tinh dai) OR (trinh dai)) cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((me hoi) or (mai hoi)). lieu va ha trung va ((tinh dai) OR (trinh dai)) cua te*.