Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
sach v » sach va, sach y, sach 2
di cua » doi cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach v ((nang ma) or (nang x)) hoi. hieu ve cham truc va hanh ((di cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach v ((nang ma) OR (nang x)) hoi. hieu ve cham truc va hanh ((di cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach v ((nang ma) or (nang x)) hoi. hieu ve cham truc va hanh ((di cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: vu sach v ((nang ma) or (nang x)) hoi. hieu ve cham truc va hanh ((di cua) OR (dai cua)) tre*.