Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
tu tieng » luc tieng, tu tuong, tu trong
sach ky » sac ky, sach y, sach ty
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x ho. hieu ((ve cam) or (va cam)) thuc van hanh tai tu tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x ho. hieu ((ve cam) OR (va cam)) thuc van hanh tai tu tieng.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x ho. hieu ((ve cam) or (va cam)) thuc van hanh tai tu tieng*.